The Arma MX is a direct bolt-on replacement for the Sur Ron Light Bee X and Talaria Sting. No additional Hardware is needed, simply bolt-on and go. Shock will be pre-tuned by EXT-USA on the information you provide. Engineered with performance and control as primary objectives, the shock structure has seen a redesign in order to be more robust. The Hydraulic Bottom-Out Circuit (HBC) has been enhanced with a wider range of adjustments, to prevent bottom-out issues, while allowing riders to use softer spring rates and providing excellent support and end stoke characteristics. Arma MX Features: 4 way adjustable: LSC-HSC-LSR-HBC (Hydraulic Bottom-Out Control) High flow 29 mm main piston 24 mm valve piston 14 mm shaft (50% larger than most other coils on the market to help deal with large side loading events) Engineered rebound circuit to separate bump and rebound oil flow – ultra-low-friction coating User adjustable HBC technology Very low reservoir pressure for maximum sensitivity and low cavitation(55 PSI) Full custom hydraulic setup that is bike and rider specific for each shock Very low hysteresis for high dynamic response High turbulent flow for progressive dampening and mid stroke support Low friction seal Thinner bottom-out bumper and debris clearing washer New low profile rebound knob for easy spring swap Included with 1 lightweight spring available in 400lb, 450lb, 500lb, 550lb or 600lbs (Lower options may be available upon request) Comes with Surron-specific mounting hardware for easy bolt-in installation. Full length and travel 10.5×3.5″ shock (do not use with a 1.5″ riser linkage) Rider Weight Spring <150 400 150-175 450 175-200 500 200-225 550 225-250 600 Note: This table is a general guide. For firmer or softer preference select a spring weight above or below. Warning: Please refer to the Sur Ron guidance regarding maximum weight limit for the bike.